Comtech EF Data CDM-625, Инструкция по установке и эксплуатации

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CDM-625 Advanced Satellite Modem Revision 1
Clock Modes and Drop and Insert (D&I) MN-0000036 (Ref MN/CDM625.IOM)
USER
EQUIPMENT
Notes:
1) The EIA-530 / v.35 interface can
operate at any data rate, with
1 bps resolution
2) Tx and Rx bit rates can be
asymmetrical
3) Works with multiple distant end
modems (STAR networks)
LOCAL END
DISTANT END
G.703 input (T1/E1)
from high stability
network source
EIA-53
0 / v.3
5
Int
e
rf
ac
e
SD
RT
RD
TT
ST
CDM-570/570L
Rx
Buffer
Clock
Synth
Core
Demod
Mod
SD
TT
G.
7
0
3 Po
rt
2048 or
1544 KHz
O
Tx timing mode:
Internal clock locked to G.703
Rx:
Buffer enabled, clocked from ST
USER
EQUIPMENT
G.703 output (T1/E1)
(all ones pattern)
EIA
-53
0 /
v.35
Interface
RD
TT
ST
RT
CDM-570/570L
Clock
Synth
Core
Demod
G.703
P
o
rt
2048 or
1544 KHz
O
Timing mode:
Usually loop timing (or Rx-Sat)
Rx buffer disabled
SD
END RESULT:
The G.703 signal at is perfectly reproduced
at , regardless of the link data rate
A
B
B
A
Any desired
bit rate
CDM-625
CDM-625
Figure 9-7. G.703 Clock Extension Mode 1
9–12